. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 103. H OSC 3 AUXILIARY MOD 3 AUXIUARY 15 KC LOW PASS FILTER AUXILIARY WIDE BAND AMPLIFIER â WIDE BAND RECORDER (C),(D)(E) (F) (G) (H) OSC 1 AUXILIARY 30 A TMS k I USED TO SIMULATE -â TEST SIGNAL FOR ADJUSTMENT PURPOSES NOTE-LETTERS IN ( ) REFER TO CORRESPONDING COLUMNS IN TABLE U FicuRK 39. Simplified (irciiil anangemeiit using System 2 with niisiliaiv a|>|xiniliis loi ()l)l;iiniim a hand-pass liUci adjiistahlc in width up to li k< and with a mid-hand fieqiiino \aiiahlc hclwcen 3 and ITiO k(. permiitiii&l
. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 103. H OSC 3 AUXILIARY MOD 3 AUXIUARY 15 KC LOW PASS FILTER AUXILIARY WIDE BAND AMPLIFIER â WIDE BAND RECORDER (C),(D)(E) (F) (G) (H) OSC 1 AUXILIARY 30 A TMS k I USED TO SIMULATE -â TEST SIGNAL FOR ADJUSTMENT PURPOSES NOTE-LETTERS IN ( ) REFER TO CORRESPONDING COLUMNS IN TABLE U FicuRK 39. Simplified (irciiil anangemeiit using System 2 with niisiliaiv a|>|xiniliis loi ()l)l;iiniim a hand-pass liUci adjiistahlc in width up to li k< and with a mid-hand fieqiiino \aiiahlc hclwcen 3 and ITiO k(. permiitiii<; the recorder to rtiii loi an a(lc(|iiate |3C- riod with the circuit arranged for liroad-ljaiid ob- servations. The synchronous motor oi the paper dri\e measures the time of these observations and the paper speed should be at a mininiuni. The circuit arrangement in Figure 40 permits ob- servations on the effectiveness of complex acoustic signals in aural masking. A variety of characteristic sounds on phonograph records is available with which to study masking effects at sonic or supersonic frequencies. Operational Studies of Complete Echo-Ranging Systems. With the apparatus connected into a com- plete system for echo ranging, actual trials are made to test the ability for locating small objects in shallow water at distances under 'i'A) iiKtcrs. A coiumoii meth- od is to suspend a small target from a rowboat which travels slowly o\er the range while the attemjJt is made to locale llic target and maintain cDiuatt with it. Clonuuon targets are 2- and 3-foot hollow spheres and a 4-loot length of 7-inch heavy walled pipe. One of these is suspended from the stern of the boat at the same depth as that of the transducer. Directions for the course of the boat and other comiuunications be- tween operators are carried on by radio telephone. The raft has a working space running its full length through the center. The apparatus rests on carriages mo\ ing on steel rails the same as on t
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